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41.

When X-rays are produced
(a)heat is generated at the target
(b)heat is absorbed at the target
(c)the temperature of the target remains constant
(d)brilliant light is seen at the target
Comment
Answer is: ANA

42.

Which one of the following reactions is the main cause of the energy radiation from the sun?
(a)Fusion reaction
(b)Fission reaction
(c)Chemical reaction
(d)Diffusion reaction
Comment
Answer is: ANA

43.

Which one of the following is not electromagnetic in nature?
(a)Cathode-rays
(b)X-rays
(c)Gamma-rays
(d)Infrared-rays
Comment
Answer is: ANA

44.

Which one of the following pairs of rays is electromagnetic in nature?
(a)Beta rays and gamma rays
(b)Cathode rays and X-rays
(c)Alpha rays and beta rays
(d)X-rays and gamma rays
Comment
Answer is: DNA

45.

Which one of the following is used as a moderator in the nuclear reactor?
(a)Thorium
(b)Graphite
(c)Radium
(d)Ordinary water
Comment
Answer is: BNA

46.

The gas which turns limewater milky is
(a)carbon dioxide
(b)carbon monoxide
(c)ammonia
(d)nitrogen dioxide
Comment
Answer is: ANA

47.

Example of covalent bond is
(a)KCL
(b)BaO
(c)CHCL3
(d)CaH2
Comment
Answer is: CNA

48.

The octet rule is not valid for which one of the following molecule?
(a)CO2
(b)H2S
(c)NH3
(d)BF3
Comment
Answer is: DNA

49.

Antacid are commonly used to get rid of acidity in the stomach. A commonly used antacid is
(a)sodium hydrogen phthalate
(b)magnesium hydroxide
(c)calcium hydroxide
(d)manganese acetate
Comment
Answer is: BNA

50.

On the labels of the bottles, some soft drinks are claimed to be acidity regulators. They regulate acidity using
(a)carbon dioxide
(b)bicarbonate salts
(c)both carbon dioxide and bicarbonate salts
(d)carbon dioxide and lime
Comment
Answer is: ANA

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